问题
We _____ talk loudly when we see the sign “Be quiet” on the wall.—Yes, you are right. We should be polite in public.
A:must
B:mustn’t
C:need
D:needn’t;
B:mustn’t
C:need
D:needn’t;
正确答案是：
同类题型
He________ full marks, but he was so careless as to make a spelling mistake.[ ]
Every year, we plant many trees on _______ side of the road to make our city more beautiful.
Students should be encouraged to use________Internet as________resource.
How many students are there in your classroom—There are__________.